Jung-woo who is a free-loving person, and Gong-chan’s past sweetheart, Se-hyun, a famous Korean sports star. There’s another couple that get involved. However, the two must join forces to go through the hardship that they must face… There cannot be a more fatal chance of meeting than the one they have nonetheless they get make a “contract sibling” agreement perhaps by their will or not.
There’s also Seol Gong-chan, a mighty fortunate man, who could handle any business of his own that he wants. Joo Yu-rin has an imprudent European attitude with full capability to do anything along with her good looks. Her major is creative writing (overflowing with lies), double majoring in acting (nice looking face with exceptional acting skills), minor major in broadcast entertainment (wonderful showmanship with quick agility of wit). However, there is one bizarre contract between two couples.
Contract dating? Why be shy when you’re going to date anyways? What? Contract siblings? That is quite something if you ask me. Contract marriage? The couple won’t live in the same room.