Jin-kang begins to see the vulnerability beneath Moo-young’s "monster" facade, and the two fall deeply in love despite Jin-gook’s desperate warnings. Jin-gook eventually admits to his colleague that he has encountered Moo-young before—years ago, when he was a rookie officer.

It is revealed that Jin-gook has been hiding the truth: Moo-young is actually his younger brother, abandoned due to tragic circumstances. However, Moo-young interprets this as another betrayal. He spirals into a vengeful state, targeting Jin-gook. Jin-kang is devastated, realizing she fell in love with her own brother (a major trigger warning here, though later plot points complicate this). (Note: Keep watching as the "sibling" reveal is the central conflict of the middle arc.)

Moo-young and Jin-gook have a violent confrontation. In a twist of fate, Moo-young saves Jin-gook’s life, proving that he is not the psychopath everyone believed him to be. The "sibling" dynamic is re-evaluated as they realize their bond is thicker than blood or grudges.

| Episode | Title / Key Event | Original Air Date | |---------|------------------|-------------------| | 1 | The Mysterious Stranger – Kim Moo-young (Seo In-guk) enters the lives of Yoo Jin-kang (Jung So-min) and her brother Yoo Jin-gook (Park Sung-woong). | Oct 3, 2018 | | 2 | Unsettling Connection – Moo-young becomes a suspect in a death. Jin-kang feels drawn to him despite warnings. | Oct 4, 2018 | | 3 | A Dangerous Game – Moo-young and Jin-kang grow closer. Jin-gook’s distrust deepens. | Oct 10, 2018 | | 4 | Past Secrets – Flashbacks reveal Moo-young’s traumatic childhood. | Oct 11, 2018 | | 5 | Crossing the Line – Moo-young and Jin-kang share their first kiss. Jin-gook investigates Moo-young’s past. | Oct 17, 2018 | | 6 | Torn Loyalties – Jin-kang chooses Moo-young over her brother’s objections. | Oct 18, 2018 | | 7 | Revelations – A key clue about a 10-year-old murder case emerges. | Oct 24, 2018 | | 8 | Unraveling – Moo-young learns he might be connected to Jin-kang’s past trauma. | Oct 25, 2018 | | 9 | Devastating Truth (Part 1) – Jin-gook discovers Moo-young may be the lost son of a victim. | Oct 31, 2018 | | 10 | Devastating Truth (Part 2) – Moo-young realizes he and Jin-kang might be siblings. | Nov 1, 2018 | | 11 | Agony – The two try to stay away but can’t. Jin-gook hides the truth. | Nov 7, 2018 | | 12 | Desperation – Moo-young confirms the sibling connection but continues to protect Jin-kang. | Nov 8, 2018 | | 13 | Breaking Point – Jin-kang learns the truth. Their love turns tragic. | Nov 14, 2018 | | 14 | Collision Course – Jin-gook decides to kill Moo-young. | Nov 15, 2018 | | 15 | The Final Straw – Confrontation between the three leads. | Nov 21, 2018 | | 16 | The Smile Has Left Your Eyes (Finale) – Tragic ending; Moo-young dies in Jin-kang’s arms. | Nov 22, 2018 |

It aired on in 2018–2019 and has 16 episodes .

The story opens with the murder of a university student, initially ruled a suicide. Detective Jin-gook notices a meticulous reconstruction of the crime scene and begins to suspect Kim Moo-young, a craft brewery assistant with a photographic memory.

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