The story begins when men and women in their mid-40s meet each other again after 30 years, in a class reunion set up by a former classmate. With their current life hidden, they all enjoy the reunion and return to their respective lives, only to find out that two of the members begin to meet frequently, causing old flames to spark again and turn into a dangerous love affair. The struggles between families and burdens of reality are described in detail, but as they solve the mystery, the friendships and love between them remain unchanged after a number of conflicts and reconciliations. The story depicts the solitude and the pain of middle age in modern life which forces the responsibility of parenthood and spouses on them and provides a chance to look back on the lives they unknowingly abandoned long ago.

• Kim Ji-soo
• Ryu Jung Han
• Choi Cheol-ho
• Lee In-sung
• Lee Ah-hyeon
• Son Ji-na
• Jeon No-min
• Yoo Tae-woong