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Kim Rok-Soo...? That is so him, don't ask me why
When the unflappable character sees someone they care about in danger and the mask slips, it's great.
But when the unflappable character sees someone they care about in danger, and the mask DOESN'T slip.
Because they understand they need to be calm and unflappable now more than ever; if it protects them, it will certainly protect the person they care about. So their voice doesn't waver, their hands don't shake. They don't panic. From the outside looking in, they're as calm as could be. They handle it.
But after it's over-when the person they care about is safe, and the unflappable character is alone-they completely shatter. Gasping breaths, sobs, barely holding it together because someone they love almost DIED, and it was far, far too close for comfort.
(Optional: Character that they care about finds them in this state and comforts them.)