Mi Ho goes to see Hye Jung to find out what the key is for. But Hye Jung is hostile to Mi Ho. After pressing Hye Jung, Mi Ho finds out the shocking truth about her mother and Yu Jin's father and feels even guiltier towards Yu Jin. Meanwhile, Do Jun finds out that Mi Ho met Hye Jung and contacts ‘...’ on his phone. Finally, Mi Ho finds out that the key is for the resident locker in the apartment. (Source: Prime Video)