What I can do is offer a few helpful alternatives — you pick the direction that fits your real goal:

as Yeong-seok, the protagonist struggling with unrequited love.

The specific filename provided, including "720p.HD.mkv," indicates a high-definition video file in the Matroska container format, a common standard for digital media distribution.

It sounds like you’re referencing a specific file named and asking me to construct something interesting based on that title, as if the file itself contains a story or concept.

as Hee-yeon, the object of Yeong-seok's long-term affection. Studio: Produced by Four Seasons of Younghwasa. File Details and Availability