In the prologue of episode four, we are taken back in time, as Sang-joon passionately leads Eun-kyung and Ki-ho into the motel with the intention of acquiring it.Behind this move lies the secret wish in his wife's suicide note - all she longs for is peace as a destination for the liberation of her soul.In her suicide note, she also expressed her deep affection for Ji Hao, and every word revealed the depth and reluctance of maternal love.

When the camera turned, Xiang Jun's figure appeared in the coldness of the prison, and he had a meaningful conversation with Xiang Zhe.He was filled with confusion and confusion, questioning why he had fallen into such a situation.Faced with Xiang Jun's question, Xiang Zhe responded with a sharp rhetorical question, what was the scene on the bridge that night?Thanks to Bao Min's help, Xiang Jun once again witnessed the true face of the murderer, and then left in a hurry, leaving many unsolved mysteries.

Today, Bao Min has quietly embarked on her own journey. She is full of indescribable obsession and excitement for delving into those thrilling murder cases.This persistence and courage earned her the unique nickname “It” in the police community. The captain even compared the challenges and excitement she faced to a dangerous hide-and-seek game.However, even in the tense moments of adrenaline rush, Bo Min never revealed too much about his inner world to the captain.

Time passed to the present again, and Yingxia embarked on a journey to Seoul with deep worries about her daughter's safety.Cheng'e's figure was still watching in secret, but Yingxia unfortunately lost her trace during the street chase.He tried to seek answers from Long Zaizhe, but ultimately failed to bluntly point out the truth about Cheng'e's suspected murder of Shixian.

Going back to a year ago, when Shi Xian booked the room, the name he used was closely linked to Cheng'e, while the phone number was as unreachable as a ghost.On the way back to the motel, Yingxia was driven by an inexplicable obsession. He firmly believed that Cheng'e was hiding an ulterior secret.This belief eventually led him to the laptop that might hold the answer, but he failed to find a safe and effective way to unlock its secrets.

On the way back, Yingxia's eyes were attracted by several white trucks. They passed by at high speed on the road, but they did not cause any harm to him.However, when he returned to the motel, he was surprised to find that the trucks had unloaded a large amount of plants and a pile of torn art portraits were scattered beside the swimming pool.All this made Yingxia feel an inexplicable urgency and uneasiness.

Driven by this sense of urgency, Yingxia began a careful search of Cheng'e's vehicle, where she discovered medicines from a local pharmacy.As the investigation deepens, he finally confronts Cheng'e after discovering clues that she hired movers to clear the furniture.In anger, he rushed into the swimming pool, pressed Cheng'e tightly into the water, and grabbed her throat with both hands.Fortunately, Cheng'e survived in the end, but her originally calm appearance completely collapsed at this moment.

At dinner time, Yingxia and Cheng'e met again.He tried to expose Cheng'e's lies through the driving recorder images, but those images could only prove that she had left alone.Blood stains found while cleaning the room, missing towels and the smell of bleach in the shower all became key pieces of evidence in the battle.However, Cheng'e retorted with half-truths, putting Yingxia into a more complicated situation.

Faced with Cheng'e's ridicule and provocation, Yingxia knew that her “conclusive evidence” was not enough to bring her to justice.What he knows better is that if he chooses to call the police, he is likely to be regarded as an accomplice for concealing the truth.In this dilemma, he made a difficult decision - to allow Cheng'e to continue her actions, but he would keep his distance from her.The dinner ended unhappily, but the conflict was far from over.Especially when Yingxia recorded the entire conversation and took away Cheng'e's laptop, it paved the way for future contests.

In the end, Yingxia stood at the door of the police station but hesitated.He knew that handing over the recordings might draw him deeper into the whirlpool.However, at this moment, the vehicle driven by Cheng'e suddenly accelerated and crashed into him... This scene not only added more tension and suspense to the story, but also laid important foreshadowing for the development of the subsequent plot.