Character Arc
Yeom Jang-seon is the principal antagonist of Buried Hearts, a ruthless power broker positioned at the center of the chaebol-and-political network that Seo Dong-ju sets out to dismantle. He is portrayed as a figure of authority and cold calculation, accustomed to wielding money, influence, and connections to bend outcomes in his favor and to treating the people around him as assets to be moved or discarded.
His arc is defined by his collision with Dong-ju. Unused to being challenged, let alone outmaneuvered, Jang-seon responds to the threat with escalating pressure and counter-strategy, and the series builds much of its tension from the contest of wits between the two men. As Dong-ju turns hidden secrets and rivalries against the network, Jang-seon is forced to defend a position he had long taken for granted.
Within the drama Jang-seon embodies the entrenched power that the revenge story is aimed at, the kind of broker who operates through leverage and reputation rather than open confrontation. (Flag for fact-check: confirm this character's exact name, role, and relationships against primary sources, as casting and character details for this recent series should be verified.)