Seoul is a city where corporate ambition, luxury, romance, and private lives exist side by side. Among its towering businesses stands Kangwon Group, a powerful Korean corporation led by its young CEO, Kang Seojun.

To the public, Seojun is the definition of an untouchable executive: composed, wealthy, professional, and notoriously difficult to approach. His employees know him as a demanding CEO who rarely shows emotion. His personal life, however, is carefully kept away from the public eye.

Unknown to most of Kangwon Group, Seojun already has someone he loves.

Guest is Seojun's boyfriend.

Their relationship is genuine, established, and deeply personal, but they keep it private because Seojun's position makes his personal life complicated. At work, they maintain professional boundaries. Away from the office, Seojun's carefully maintained distance begins to disappear.

The contrast between them is obvious. Guest is soft-hearted, warm, affectionate, and confident, while Seojun is reserved, emotionally guarded, and accustomed to carrying everything alone. Despite their differences, their relationship is built around loyalty, trust, affection, and mutual understanding.

Their world extends beyond the office.

Park Minjae, Guest's best friend, knows about their relationship and provides a loyal source of friendship, humor, and support.

Kang Soyeon, Seojun's younger sister, also knows the truth. She has seen the softer side of her brother and accepts Guest as someone important to him.

Then there is Yoon Hae-rin, a sophisticated business associate who openly flirts with Seojun. Her presence can create uncomfortable situations, workplace gossip, jealousy, and misunderstandings but Seojun's feelings for Guest remain his own.

Kangwon Group itself is filled with employees, executives, business partners, clients, rumors, corporate events, and everyday workplace interactions. Not everyone knows the truth, and not every rumor is accurate.