Cheon Seo — Jin Husband

Their affair is the heart of The Penthouse ’s second season. Seo-jin is initially intoxicated by Dan-tae’s ruthlessness; he is the more powerful version of herself. He doesn't just tolerate her cruelty—he champions it. Together, they plot, kill, and gaslight their way to the top. When she finally leaves Yoon-cheol and moves into the Penthouse with Dan-tae, it feels like her ultimate victory.

Yoon-cheol begins as a seemingly sympathetic character—a brilliant neurosurgeon and department head at Hera Palace’s affiliated hospital. But his marriage to Seo-jin is a classic deal with the devil. He married her for her father’s money and influence, trading his dignity for a shortcut to power. Seo-jin, in turn, married him for a respectable facade and a talented consort who would never outshine her.

Seo-jin never has a "husband" in the traditional sense of a loving, supportive partner. Instead, she has a series of consorts in her war for the Penthouse. Let’s break down the three primary men who hold the title—or the functional equivalent—of her husband. Officially, Ha Yoon-cheol (Yoon Jong-hoon) is Cheon Seo-jin’s first and most legally binding husband. He is the father of her daughter, Ha Eun-byul, and the live-in embodiment of her transactional view of love. cheon seo jin husband

And that, perhaps, is the most terrifying and tragic thing about her.

Killing Joo Dan-tae (multiple times, as the drama’s absurdist logic allows) becomes Seo-jin’s final act of reclaiming her agency. He is the husband who nearly consumed her entirely. To truly understand Cheon Seo-jin’s search for a husband, one must look at the man who shaped her most: her father, Cheon Myung-soo, the chairman of Cheonmyeong Group. In a psychological sense, her father is the only man she ever tried to impress, and she has spent her entire life looking for a substitute. Their affair is the heart of The Penthouse

Their relationship is a masterclass in toxic co-dependency. Seo-jin constantly emasculates Yoon-cheol, reminding him that he is a "parasite" who lives in her father’s shadow. She has an open affair with his rival, Joo Dan-tae, right under his nose. Yoon-cheol’s response is not love but a simmering, resentful rage that eventually explodes into violence—and murder.

Chairman Cheon is a monstrous patriarch who values his music and legacy over his daughter’s humanity. He forces her to prioritize the Penthouse over love, driving away her first true love (and the father of her secret son), and constantly pits her against Shim Su-ryeon. Seo-jin’s desperate need to "win" the Penthouse is a cry for her father’s approval that she never received. Together, they plot, kill, and gaslight their way to the top

But this marriage of monsters is destined for a bloodbath. Joo Dan-tae does not love Seo-jin; he loves the idea of breaking her. He uses her as a weapon against Su-ryeon and discards her the moment she becomes a liability. The most iconic scenes of their relationship involve violence: Dan-tae strangling Seo-jin, Seo-jin stabbing Dan-tae with a trophy. Their "honeymoon" is a constant power struggle, culminating in Seo-jin finally realizing that she was never a partner—she was always just his most useful pawn.