Season 1

At the Chinese border, Cho-in gets shot and loses consciousness. On a Korea-bound flight, Seon-woo helps a sick person whom he takes to his hospital.

In China, Young-ji becomes Cho-in's guide. She is told he is a Korean con artist on the run, and is instructed to monitor his every move.

Cho-in successfully removes Young-ji's appendix. Young-ji realizes she was wrong to think he was a con artist, and saves him from Bok-geun.

Cho-in goes missing. Seo-yeon flies to China with Seon-woo and collapses upon seeing Cho-in's belongings. Young-ji's pictures are in his camera.

While running for his life, Cho-in sees posters in an alley and stops in his tracks. He forgets he's being chased, and Gang-cheol jumps in to help.

As Cho-in doesn't recognize him, Seon-woo says he's not his brother. In Korea, Seon-woo proceeds with Cho-in's funeral although he knows he's alive.

Cho-in is determined to recover his memories with Young-ji. Having come to Korea under a false name, he gets grilled by the NIS as a murder suspect.

Upon seeing Seo-yeon, Young-ji takes Cho-in's hand and runs away. Cho-in feels sad about Young-ji's shabby place, and they spend the night together.

Upon seeing Chi-soo at Young-ji's place, Cho-in jumps at him with rage. He says he is responsible for her brother's death, but she tells him to stop.

Young-ji finds out that Cho-in is trying to get his memories back, and they fight. Her saying that he will lose his memories with her saddens him.

Young-ji finds out that Cho-in is trying to get his memories back, and they fight. Her saying that he will lose his memories with her saddens him.

Young-ji throws herself in front of a car to save Cho-in, and they get transported to a hospital. Seon-woo tries to put an end to Cho-in's life.

Cho-in is shocked to see Seon-woo and Seo-yeon kiss. Seo-yeon tries to run after him, only to be stopped by Seon-woo. Cho-in wallows in sadness.

Cho-in's surgery on Chi-soo is a success. Cho-in goes to the ICU, but Chi-soo is long gone. He only left a letter that says he's indebted to Young-ji.

Cho-in is riddled with shock when he hears that his only brother tried to kill him. After seeing his brother nervously look for him, he turns back.

At Seo-yeon's invitation, Cho-in goes to dinner, but feels uncomfortable. At the dinner table, Seon-woo announces he and Seo-yeon will get married.

After confirming Seo-yeon knows everything, Seon-woo becomes enraged. He goes to see her and comes clean about Cho-in. She is speechless…

A board meeting begins, and Cho-in refuses to give up. He learns that Chi-soo is with Young-ji, and ends up getting arrested for murdering Bok-geun.

Cho-in learns about Seon-woo's condition, but he cannot forgive him. A new poster at the hospital gets people talking, and Seon-woo is cornered.

Cho-in turns a blind eye to Seon-woo, who has a brain hemorrhage. As his condition worsens, his mother begs Cho-in to save him, but he refuses.