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| Korean drama Dive Into You EP 4 Review. |
In Episode 4 of Dive Into You, Ha-na and Ha-ru discover that their strange body-swapping experience is far more dangerous — and far more useful — than either expected. What first looks like a bizarre shared dream turns out to have changed the timeline, leaving Woo-jae’s fate, Ha-ru’s judo career and even the present completely different.
The episode returns to the 2010 tournament, where Ha-na is trapped inside Ha-ru’s body and makes the rather unfortunate decision to hug Woo-jae. His response is immediate: he throws her to the ground and wins the match. Not exactly the reunion anyone had planned.
Ha-na and Ha-ru are left equally bewildered before Ha-ru drops the camcorder. Moments later, they wake up in hospital in the present. For a brief moment, it looks as though the whole thing was simply a shared hallucination. Then Ha-ru admits that he experienced exactly the same events.
That changes everything. The past has actually been altered. Ha-ru now has a silver medal instead of the gold he originally won, proving that whatever happened in 2010 has travelled forward through time with them.
Naturally, Ha-na immediately sees the possibilities. If they can alter one event, perhaps they can prevent Woo-jae's death and even repair other parts of their lives. The only catch is getting the mysterious camcorder working again, because apparently saving someone's life now requires troubleshooting vintage electronics.
Water seems to be connected to the process. After experimenting with a bath, the siblings eventually head to a swimming pool and recreate the circumstances surrounding their first jump through time. They dive underwater together, and the bizarre mechanism appears to work again.
They wake in 2010 with their bodies switched once more, suggesting that the camcorder, its old recordings and water are all connected. The drama still keeps the exact rules deliberately murky, though, because apparently giving everyone a straightforward instruction manual would make things far too easy.
There is another complication. The recording of the judo match has vanished. Ha-na takes this as further proof that they are not simply witnessing history but actively rewriting it. Ha-ru, meanwhile, tries to piece together what happened on that particular day and how they might use their new ability without making everything even messier.
Their search eventually takes them to the beach, where they find Woo-jae alive. The group spends New Year together, and Ha-ru's behaviour while occupying Ha-na's body is strange enough for Woo-jae to call her adorable. The joke works because Ha-na is literally standing there inside Ha-ru's body, watching the whole thing unfold with understandable irritation.
The bigger issue is Woo-jae's future. He is preparing for the national team trials and dreams of making the squad alongside Ha-ru. But history says he will suffer a shoulder injury around May, shortly before the trial, forcing him to abandon judo.
That gives Ha-na and Ha-ru a very specific target: stop Woo-jae's injury before it happens. If they succeed, perhaps they can preserve his career and prevent the chain of events that eventually leads to his tragic fate.
Unfortunately, changing the past does not mean Ha-na gets an easier time in it. With their roles reversed, she finds herself heading to judo camp inside Ha-ru's body. The dormitory is hardly a five-star retreat either.
Han Soo-hyuk is among the other athletes, and his rhinitis means he can barely smell anything. This becomes particularly unfortunate because his laundry habits appear to be roughly as impressive as his sense of smell. Then there is Pyo Gyeong-woo, who is built like he was designed specifically to make everyone else in the dorm feel inadequate.
Ha-na's reaction is immediate and wonderfully chaotic. She screams when she sees him, clearly questioning every decision that brought her to this particular judo camp.
Her attention soon returns to Woo-jae, whose shoulder has become her obsession. She spends much of the camp trying to protect him from the injury she already knows is coming. It is a difficult task when everyone around her is simply trying to get through training without knowing that their future is being quietly rewritten.
Ha-ru also arrives in Ha-na's body, but his appearance brings an even bigger problem into focus. Woo-jae's father has seen a newspaper article describing his son as the future of Korean judo and suddenly takes an interest — not out of parental pride, but because he wants money.
His relationship with Woo-jae's mother is equally bitter. He warns Woo-jae not to look for her if he still wants to regard him as his father, adding another ugly layer to an already complicated family history.
Ha-ru overhears the conversation and starts looking for ways to protect Woo-jae. He even considers whether a restraining order could help. Before he can get very far, however, Ha-na calls with a more immediate problem: Woo-jae is being chased by men connected to Real Love Capital.
The men believe Woo-jae is worth 500 million won because of his promising judo career. Woo-jae attempts to escape but ends up face-to-face with their boss, who reveals the source of the problem. His own father has directed them towards him because of money he owes.
Worse, Woo-jae's father has effectively treated his son's future as an asset. The men want access to his sponsorship money, while some of them even joke about injuring other competitors so Woo-jae has a better chance of winning.
That plan lasts about as long as you would expect once Ha-ru arrives in Ha-na's body. Using his judo ability, he takes down all three men and finally gives Woo-jae some breathing room.
But winning the fight does not solve the deeper problem. Woo-jae is devastated by what his father has done and admits that he feels he can never escape the man's influence.
The next morning, Woo-jae quits judo and withdraws his deposit. Ha-na races out of the dormitory and desperately tries to reach him, but he does not answer. The situation is slipping away just as quickly as the siblings had begun to believe they could control it.
Then the camcorder runs out of power.
Ha-na suddenly wakes up in the present on May 25, one day before the awards ceremony. At first, things seem familiar, but the differences quickly become impossible to ignore. Woo-jae is no longer listed in Ha-na's phone, and Ye-rang confirms there is no record of him in the security arrangements either.
Their changes to the past have completely rewritten the present.
That creates an even bigger problem. Ha-na still remembers the man who tried to kill her and knows he is expected to appear at the awards ceremony. Woo-jae is no longer there to protect her, meaning the person who once stood between her and danger has effectively been erased from her present.
The episode therefore ends with Ha-na facing a much more uncertain future. She may have succeeded in changing Woo-jae's fate, but the price is that she has removed one of the people who could have helped keep her safe. Episode 4 turns the time-travel mystery into a genuine race against consequences, because every attempt to fix the past appears capable of creating an entirely new problem in the present.
My take on Episode 4 is that this is where Dive Into You becomes considerably more entertaining. The body-swap comedy still works, particularly when Ha-na finds herself trapped in a judo camp full of sweaty athletes and questionable laundry habits, but the story is now giving the gimmick some actual weight. The most interesting part is not simply whether Ha-na and Ha-ru can travel through time, but whether they should. Saving Woo-jae sounds like the obvious answer until the present starts changing around them.
Suddenly, every good intention comes with a receipt. Woo-jae being alive is great, except now he has disappeared from Ha-na's life entirely. Ha-ru's medal changes. The security arrangements change. The threat remains. It is a neat reminder that time travel in dramas is rarely a free repair service. Episode 4 also does a good job balancing humour with the more emotional material surrounding Woo-jae and his father. The result is an episode that feels busier and more consequential without losing the slightly chaotic charm that makes the premise work.
With Woo-jae erased from the present and Ha-na facing the awards ceremony without his protection, the next episode has plenty to untangle. Do you think Ha-na and Ha-ru have actually saved Woo-jae, or have they made his fate even more complicated? And can they stop the attack now that the timeline has changed?