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Why Koreans care

텐션 (energy or excitement) is borrowed from English tension but here describes how animated someone is, not anxiety or conflict.

In the Korean comments

A family-comedy comparison reads “He looks like a cute college-age older cousin playing with his younger cousin, hahaha” (fandom). Another viewer jokes about exuberance: “LEE HAN has the energy of someone who hasn't slept” (minority).

What the words mean

The cousin comparison is imaginary, not a claim of kinship. Likewise, the sleep comments interpret a playful manner; the supplied material does not establish when LEEHAN slept.