Bank Christopher Chan.

Christopher Chan Lee Minho's Characteristics
Emotions: On the outside—fatigue and rarely anger. On the inside—constant anxiety. On the outside—calmness and irony. On the inside—calibrated coldness.
Weakness: Afraid of loss. Can't rest. Ruins health. Afraid of being unheard (that's why he keeps silent, but his words are effective).
Strength: Sacrifice, tactical genius, leadership skills. Insight, self-control, the ability to see the essence of people.
How they've changed: from a robot to a living person who acknowledges pain. From a rebel to a wise guardian.
Role in the couple: He is the heart (wounded, but still beating). He is the mind (cold and protective of this heart).

Appearance and demeanor: Smart, collected, always buttoned up, even in the pre-dawn gloom. He maintains a calm, icy dignity. In his youth, he was a sarcastic, venomous man with dark, piercing eyes and a mocking curve to his lips. Now, his eyes have deepened, and his smile is rare, but when it appears, it brings warm wrinkles to his eyes. His weapon is not a shout, but a quiet voice that makes the spines of new recruits clench.
Character and behavior: "His tongue has shortened"—he's stopped arguing for the sake of arguing. His venom has transformed into a cold, matter-of-fact frankness. He doesn't flatter or openly insult, but speaks the truth to your face, even if it's harsh ("Hungry corpses are heavier. It's physics.") He's achieved greatness, but doesn't seek glory—he rarely advertises himself, conducting recruit training like a sacred rite. He cares for Chan discreetly, without sentimentality, as if it were part of his combat manual.
Relationship with Chan: He recognized the human in the "devil" and wasn't afraid of it. It was Minho who first stopped seeing the colonel as a beast and saw his weariness. He smiles at Chan more often than at anyone else—this smile is like a reward, doled out in measured doses by the major. He respects Kris for his honesty, his strength, and for not breaking him fifteen years ago. Their connection is mutual: Minho heals Chan's soul with his silent presence.
Key Trait: Transformation. In his youth, he was a fountain of venom, a challenge, a desire to prick authority. Now, he's a dam of calm and cold efficiency. He hasn't softened (as Chan thinks), he's simply forged his edge into steel. His silence isn't weakness; it's the ultimate form of self-control.

Appearance and demeanor: He looks older than his years (gray hair at the temples, deep wrinkles from constant tension). His gait is heavy, with a noticeable creak from his prosthetic (a memory of the war). His gaze is inflamed, red from lack of sleep, but tenacious like a predator's. Even at rest, his hands rest on his machine gun as if they belonged to him.
Personality and behavior: Over fifteen years, he's become more human, but he hasn't softened. He used to be a fierce, unyielding robot, for whom service was his only universe. Now, he's simply a very tired man who's afraid of losing someone else. He's lost many colleagues (hence the insomnia and ingrained anxiety). Chris isn't angry, he's burned out. He eats poorly, doesn't sleep, and drowns his inner emptiness in black coffee and work. He smiles rarely, heavily, with the corners of his lips—but when he does, it's always sincere.
Relationship with Minho: At first, rage and defiance (Minho was the only one who ever drove him crazy). Then, a silent respect. Now, a quiet affection, which he expresses through grumbling and complaining. He allows Minho to boss him around in everyday life (like forcing him to eat), because deep down he recognizes that this major has the right. Kris misses Minho's old "poisonousness," but values ​​his quietness and reliability.
Key Trait: Fatigue. Not physical, but existential. He continues to fight and train recruits because he knows no other way. His devilish past reputation is simply a mask for someone afraid of getting attached and losing someone again.