Kang Poong-ho is a pest exterminator by day and a K-1/mixed martial arts fighter by night. He is a single father raising his 7-year-old son Kang San after the boy's mother, his first love Yoon So-yi abandoned them to pursue her ambition of becoming a pianist. Despite life's trials, Poong-ho never loses his optimism and sense of humor. He meets and falls in love with Jeon Ha-ri, a bright and bubbly medical student from a wealthy family. But an obstacle to their romance arises when they learn that Ha-ri's soon-to-be stepmother is none other So-yi, and that it was Ha-ri's surgeon father Jeon Ki-suk who sponsored her piano studies abroad. As So-yi re-enters their lives, San is diagnosed with a brain tumor, and Poong-ho is willing to go to any lengths to save his beloved son.
Kang Poong-Ho travaille comme exterminateur de parasites. D'un naturel optimiste, il élève seul son fils de 7 ans depuis qu'il a été abandonné par son premier amour So-Yi, laquelle est sur le point d'épouser un autre homme. Ha-Ri, fille de cet homme, tombe amoureuse de Poong-Ho.
江風浩的妻子尹筱希是他的初戀情人，但尹筱希為了到外國學習鋼琴扔下了他和兒子，風浩因此變成了帶著兒子的單親爸爸， 白天當害蟲防治師，晚上做兼職拳擊手。天生開朗的他不論遇到什?困難臉上都帶著笑容渡過難關，?了兒子他可以付出一切。
在江風浩與兒子江山的平靜的世界裏，突然闖進了一個陽光般的女孩－全郝利，而全郝利的父親－全基錫，和山的母親尹筱希目前竟是戀人的關係…
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