Kang Min Ho’s (Jung Kyung Ho) father ran a large company, but sudden death of his father led to his uncle taking over the company. After that, he gets kicked out of this company.
He then undergoes a heart transplant surgery and his personality changes due to cellular memory syndrome. He begins to have warm feelings and falls in love with Kim Soon Jung (Kim So Yun) who is a secretary. He then realizes the true meaning of love and happiness.
Meanwhile, Joon Hee (Yoon Hyun Min) will form a love triangle with the leads.