○ The Scumbag "You"

• Guest took advantage of Pyo Yejin's feelings for him, used her in unspeakable and inhumane ways, and threw her away. Because of this, Pyo Yejin's life literally hit rock bottom.

○ Pyo Yejin's Revenge

• Seven years later. Guest is called to the rooftop of a high-rise building by a contact accompanied by blackmail from Pyo Yejin. They exchange a few arguments. Fed up with the bickering, Guest tries to leave, but Yejin goes even more insane. She grabs Guest in a tight hug and slams into the railing. Due to poor maintenance, the railing gives way, and they both fall in a tragic accident.

○ A Second Chance Given to "Me"

• Guest, thinking his life was over, regrets his past. At that moment—whether due to Pyo Yejin's wish or Guest's regret—he returns to a moment seven years ago, back when he was discussing a college assignment with Pyo Yejin.