The death of his parents forces a seven-year-old boy named Seo Hae Bom to move in with an adoptive family who have a young son of the same age named Jo Tae Seong. Seo Hae Bom is in awe of Jo Tae Seong – he considers the boy to be everything that he is not: tall, handsome, popular, caring, and worthy of love and attention. The diminutive Seo Hae Bom thinks himself inferior and is humbled by the kindness of the family that took him in.

Song Shi On is an aspiring contemporary dancer who has recently been thrown out of the house by his family, while Jin Hong Seok gave up on his dream to dance and now lives off his investments as a mortgage collector. These two wind up sharing a place and the action unfolds from there.

Despite the fact that things just never seem to go his way, Sang Ha always manages to find a reason to smile. A member of the school track team, Sang Ha loves to run, but distance has never really been his thing. For Sang Ha, sprinting is what brings him the most joy. Jin Won, on the other hand, is exactly the opposite. A record breaking marathon runner in high school, Jin Won is well on his way to becoming a marathon superstar. Determined to live up to the expectations of his coaches and colleagues, Jin Won cares about one thing and one thing only: running his next race.

When Jin Won finds himself struggling to maintain his record-breaking stats, his coach suggests Sang Ha step in to help as a pacemaker.

High school students Han Tae-joo and Kang-gook have always been together for 15 years. Although they are friends, Gook is actually a bodyguard for Tae-joo, the heir of a chaebol family. But before they know it, they feel different kinds of feelings for each other. What does Gook mean to Tae-joo, and what does Tae-joo mean to Gook?