A man whose artificial heart is running out of battery and a woman who has the power to recharge him.

A delightful family drama that asks the true meaning of 'happiness' by showing various aspects of marriage such as divorce, remarriage, and single life, and brings about empathy and laughter from all generations. Maeng Gong Hee is a contract designer at Jayce Fashion. Having inherited her strong mother's spirit and her former detective father's athletic ability, she is a rare wild woman these days who has the guts to survive even if she were to be stranded on a deserted island. Gu Dan Soo is the grandson of Jayce Fashion Chairman Hwang Ik Seon and born to a wealthy father and a poor mother. Dan Soo, who was living as a free spirit in a foreign country, comes to Korea according to his grandmother's plan to make a successor to the chairman out of him and he reunites with childhood friend Maeng Gong Hee once again.

The war of jealousy and desire of four friends, one of them became a murderer due to lies of the others 10 years ago and appeared in front of the three successful friends.