One day, a man was approached the boy....

Min-Hyuk, a music professor, went to find the violin he left in a lesson room and found a student playing his violin.
Min-Hyuk, who heard the charming but not perfect performance that drew him in, felt attracted to the student, Han-Bin.
However, when the new semester started, Min-Hyuk found out that Han-Bin was about to drop out due to difficult family circumstances, and so he helped Han-Bin continue to go to school and allowed him to live in his house.
But as Han-bin enters the house where Min-Hyuk lives with his beautiful wife Min-Joo, and his Phys Ed major son Hyun-Jae, some changes are occuring in Min-Hyuk's family....