"Ab"solutely Must Watch

ML - Naked upon time travel.  Only show his upper body.  Fake sex scene w/stunt double.

ML - ML who is not shy to show off his rockin body.  His abs made an appearance in almost all the scenes.

Seo Ji Hoon - swims in waterfall

Lee Jae Wook - tied up shirtless

Not my favorite abs - multiple scenes w/his shirt off

ML - shirt off as FL paints a talisman on his chest

ML - almost getting killed by your aunt never looked so sexy. I guess the dagger goes in better w/your shirt off?

ML 

ML - walks around shower area in HS...FL not phased at all

ML & ML2 both with scenes w/shirt off

SuppM- Mechanic takes his shirt off....tons of back muscle definition

ML has his shirt off a lot...not complaining 1 bit!  

Lee Chae Min has his handbok open
SuppM - shirtless while forging pressure cooker

ML - in his towel a couple times.

ML - Ok Taec Yeon

Kim Do Wan - shirt off after vomiting on it during drunkness & waking up in hotel w/FL2

Sooo many shirtless scenes & soo many guys (mostly young boy body types)

SupportM - Yu Cheng En - soaking in the bath scenes...his shoulders/top of chest looked muscular.

Takeuchi Ryoma

ML - Swimming competition
ML + ML2 fall off bridge into water

Lee Chamin - has all superhero injections pu tin
Lee Jun Ho - puffering in front of mirror

Only a deep V neck button cardigan but what is showing is alluring.

Lee Je Hoon - Final scene

ML - muscular arms & 1 good shirt off scene.  Slender muscular V shape chest.