In Episode 4, Gwi-ju inadvertently hugs Da-hae to protect her from an oncoming bike. Da-hae accepts the flowers from Gwi-ju as he vanishes once more. Gwi-ju returns to the present near the Bok family’s home and informs his father, Soon-gu, that he was successful in rescuing someone in the past.
Soon-gu leads Gwi-ju to a hidden chamber within the library that houses the history of their ancestors and their extraordinary abilities. They discover that certain ancestors were able to improve their skills with the help of the right person entering their lives as a catalyst. Soon-gu is curious if Da-hae could be the catalyst that Gwi-ju needs.
Gwi-ju comes back home to discover that Da-hae is shaken up after seeing a future version of himself that was wet and had no reflection. Da-hae loses consciousness, and Dong-hee raises doubts about Da-hae being in the Bok family’s vault. Afterwards, Ms. Bok has a feeling that Da-hae will end up in the hospital after visiting a sauna, so she tells Da-hae to avoid going to saunas.
Gwi-ju secretly follows Da-hae and finds out that she is being threatened by a loan shark named Il-hong, who is not actually related to her. Il-hong is asking Da-hae to assist in targeting the Bok family in order to repay the money that was lent to Da-hae’s deceased father. Gwi-ju unintentionally causes Da-hae to pass out while attempting to save her from the sauna.
In the hospital, Il-hong tells Gwi-ju that Da-hae’s previous trauma is connected to a fire that happened at her school. Gwi-ju then escorts Da-hae back to his house, where he reveals his family’s supernatural abilities and informs her that she is the only one who can perceive and interact with him.
Ms. Bok confronts Gwi-ju at the Bok house about disclosing the truth to Da-hae. It has been uncovered that Ms. Bok has not been able to have any dreams related to the family’s financial situation for the past 7 years, which has added to their difficulties.
At the same time, Da-hae isolates herself in her room, planning her next moves as Il-hong has expressed his desire for her to marry Gwi-ju. In another place, Hye-rim the girl who had wanted In ah yo join their dance group discovers Jung woo, her crush is interested in her. After reading Hye rim’s mind, In ah calls Jung woo a jerk in other to keep her friendship with Hye run but she’s unaware that Jung woo heard her. Grace and Dong-hee have a discussion that leads to both of them understanding each other better. Dong hee isn’t ready to fight with her over a man and that impresses Grace.
Gwi-ju goes back in time to the sauna, where he follows Da-hae and sees things he was not supposed to see. Coming back to the present, he stands under the shower to clear his mind, then imagines the moment when Da-hae witnesses Dong-hee soaring through the air. Gwi-ju catches Da-hae as she falls, causing her to scream and run away.
In the current moment, Da-hae gives Gwi-ju a signed marriage registration, saying it was a present from the future Gwi-ju. Gwi-ju is confused but stresses the importance of love preceding marriage. He then leans in and kisses Da-hae.
