Fyi there not twins they just look alike like other brother's maybe
Hanwool and Hangyum are twins.
14 your twin brother is coming back18. Yes I have a twin brother...39. Also, for chapter 39. Fan translation has Jaehee saying twins when Tapas changed it. Th Korean makes sure to establish they are twins more than the English.
Fyi there not twins they just look alike like other brother's maybe