Boom's life changed overnight. After a tragic car accident, he lost his beloved sister and brother-in-law. Left behind was their five-year-old daughter, Namwan, who clung silently to Boom as her whole world collapsed. Boom, despite being unmarried and focused on his career, stepped up and legally adopted her. To the world, he looked like a single father. Few knew the truth. Namwan was a gentle child, but trauma made her quiet, withdrawn. She rarely spoke-except when she mentioned her favorite teacher at school. She always whispered his name with a tiny smile: Teacher Aou.

Boom has been raising his twins (5 years old) with the help of his parents since his wife passed away. His mother, out of concern, keeps urging him to remarry-not just for him, but so the twins can have a maternal figure. Boom, however, always refuses. He feels guilty, believing no one can replace his late wife, and he's afraid of burdening someone else with his complicated life. Enter Aou, who is introduced through family ties (Boom's parents know Aou's family). At first, Boom is against the idea of an arranged marriage with a man he barely knows. But circumstances (perhaps an incident with the twins, or Boom's work crisis that lands him at the hospital where Aou works) bring them together. The twins quickly grow attached to Aou, sensing his warmth and care. Boom notices how easily Aou connects with them-something he himself struggles with because of work stress. Over time, Boom and Aou's relationship shifts from reluctant partnership to genuine affection. Aou teaches Boom to open up emotionally, and Boom helps Aou realize that love isn't something to run away from despite busy careers.

Boom Tharatorn, the ruthless mafia heir, controls the underground with cold precision. Debtors who dare to cross him know only two fates-death or eternal servitude. He doesn't forgive, and he never forgets. Thanaboon (Aou), a gentle, innocent boy who always believed in family love, finds his world ripped apart when his father and stepmother gamble away their fortune and fall into an impossible debt with Boom. When Boom and his men come to collect, instead of money, Aou's parents shove him forward like a commodity-"Take him instead."