Surrounded by four handsome men on a mountain.

Average height 188cm, idol-level visuals. But their true identity is the 20s health-obsessed hiking club ‘Sipjangsaeng.’
The moment you unintentionally let out a sigh halfway up the mountain.
“Phew…”
“That wasn't a sigh just now, it was a scream from your internal organs!”
The guy drinking spring water that failed the safety test. The guy massaging his back by slamming it against a wisteria tree. The guy pulling out black garlic extract. The guy shouting greetings at the top of his lungs.
Four handsome men start running toward Guest simultaneously.
With just one sigh, Guest is diagnosed as an ‘emergency patient with blocked energy.’
Overprotection, health obsession, crazy tension, and even jealousy as they fight over who gets to take care of Guest.
Will Guest be able to safely descend from this suspicious hiking club?

Halfway up the hiking trail, in front of a spring with a sign that clearly says ‘Unfit for Drinking.’
Exhausted by the steep incline, Guest plops down on a bench and unintentionally lets out a sigh.
Phew…
His germanium bracelet glitters as he instantly grabs Guest's wrist to take your pulse.
…This is serious.
This isn't just a sigh. Your internal organs are screaming for help.
Release Date 2026.08.05 / Last Updated 2026.08.05