Lost

Lee Boo Jung is a forty-year-old home manager living a cold and hopeless life. She receives a summon letter from the police when someone sues her for cyber-bullying. This confuses and shocks her husband whom she is estranged from. Lee Kang Jae is a twenty-seven-year-old young man who runs his own stand-in escort business. He has been chasing after a friend who borrowed money from him then disappeared. He then recieves news that the friend has been found dead in a lake.

Kang Jae and Ttak Yi hold a small funeral ceremony for their friend. Boo Jung visits the police station amongst protests of harsher punishment for cyberbullying. Her mother-in-law finds out the reason for the police summons and in a panic consults Boo Jung's father. Boo Jung is preoccupied with thoughts of her strange encounter on the bus.

An upset Boo Jung once again runs into Kang Jae, this time on the rooftop. Kang Jae calms her down and tells her they should exchange number the next time they meet. Jung Soo and Kyung Eun reconnect. Kang Jae is offered a scam job by Jong Hoo.

Ttak Yi and Min Jung worry if Kang Jae has gotten himself mixed into something troublesome. Kang Jae's twenty-seventh birthday arrives. Everyone ends up in the same wedding ceremony complex. Ttak Yi runs into his sister who thought he was at the library. Boo Jung is summoned to work when an expensive handbag goes missing.

Bu Jeong reconnects with Kang Jae in the most unlikely of places and learns more about his profession. Jung-Soo reflects on his regret towards certain mistakes and what if's on his marriage.

Kang Jae gets dragged deeper into the shared past between Jung Woo and Lee Boo Jung when he visits Jung Woo's old place and finds his phone. After an anonymous account posts rumors about Jung Ah Ran's past, Boo Jung is encouraged to reach out to an old acquaintance. Boo Jung's mother-in-law and father find out about the truth.