After years of being estranged from his older brother Kang Min-gu (Kim Young-jae), Bok-gu finally reconciles with him.

Min-gu attempts suicide upon learning of the engagement of his ex-girlfriend, Cha Eun-suk (Shin Min-ah).

Caught in a compromising position with Kim Joon-sung (Lee Ki-woo), heir to a large conglomerate, she is forced into an engagement with him.

Bok-gu incorrectly assumes that Eun-suk is a social climber who broke up with Min-gu upon achieving success because she thought he would be a burden.

Then using the same method as his brother (as detailed in Min-gu's diary), Bok-gu woos her thereby humiliating and shaming her when made public.

When Bok-gu is arrested, Eun-suk publicly acknowledges her relationship with him to secure his release, knowing full well that the ensuing scandal will ruin her career.

Eun-suk is devastated not only by this news because societal norm doesn't allow for romantic relationships with the deceased or divorced persons siblings, but also when she sees Min-gu in his current state.

She goes to Bok-gu's house and re-unites with Min-gu, who has awoken from his coma and is not able to speak, but clearly recognizes Eun-suk and is overjoyed to see her.

Because Bok-gu's guilt won't allow him to be with his brother's former girlfriend, and social scorn prohibits a woman from having a relationship with two brothers even after one dies, Bok-gu and Eun-suk realize their love is doomed, but they agree to forget everything for just one carefree day and night together before parting for good.

Bok-gu, too, has achieved fame after winning a championship fight and he has saved money to open his own auto shop.

Source: TNMS Media Korea An Indonesian remake was titled Bodyguard Jatuh Cinta.

In Thailand a remake was titled รักซ่อนแค้น (rạk s̀xn khæ̂n; literally: Love Hidden Revenge) on ONE HD directed by Attaporn Teemakorn beginning July 26, 2017.