《MAN X MAN》是韩国JTBC电视台于2017年4月21日首播的金土连续剧，由李昌民执导，金沅奭编剧，朴海镇、朴成雄、金玟廷、延政勋等主演。
该剧以特殊警卫要员金蔎雨与大明星吕云光的兄弟情作为焦点展开，讲述长时间以明星身份生活的演员和其拥有特殊调查权、负责警卫工作的保镖之间所发生的故事。

许阁为《Man To Man》献唱第三波OST《The Reasons 》。《The Reasons》是一首忧伤钢琴旋律与许阁感性歌声完美结合的抒情曲，由Lovecitty团队担当制作，歌词讲述「心爱的人便是自己活下去的理由」，在《Man To Man》第三集，吕云光回想起过去听到宋美恩结婚消息时的片段曾经出现过，令人印象深刻。
JTBC Gilt Drama `One Man` OST Part. 3
- Hagak's "Why You Are"


'Reason of You' is a sophisticated ballad that blends warm and soft orchestral sounds with a gentle piano melody. It is the most gentle and deeply melodic song of the "One Man" OST.
Also, through the emotional voice of Gyu-gang, the lyrics such as the poetry of the electrolytic will give a different impression to the viewers.
'You Really Really' has recently perfected the production of 'Love City,' a sensational composition duo 'Love City' that has received much attention as a drama and movie OST.

[Credit]

1. Reason for you
Produced by Love City
Lyrics by SDJED
Composed by Love City
Arranged by Seongmin
Vocal by Heuki
Strings by Jam String
Recorded by Jung Min at Studio M
Mixed by Jung Min at Studio M
Mastered by Dae Jung Sook & Park Jun (SoundMAX)