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A woman seeks to take revenge when her younger sister disappears and she finds out that her sister suffered violence and sexual abuse from school bullies.
A web-comic artist finds that a series of murders are occurring that have a disturbing resemblance to the images in her work.
On a live music radio show, a letter arrives from the 23 years in the past. Through the letter, the first love and friendships of five friends are revealed.
Kim Sung-Joon (Park Si-Hoo) worked as a pilot, but after becoming in deaf in his right ear he has worked on the ground. He becomes desperate. Kim Sung-Joon then meets Eun-Hong (Yoon Eun-Hye) on a blind date. Even though he doesn't love her, he gets married to Eun-Hong. After their marriage, Sung-Joon treats Eun-Hong with indifference. Suddenly, Eun-Hong dies. Kim Sung-Joon soon learns for the first time about her real heart and her first love. Holding Eun-Hong's urn, he seeks out her first love.
