similarities
- comedic+extroverted dude and introverted, elegant dude duo!
- story is mainly abt 2 male leads
- both are costume dramas
- long series (TU 50eps, HS 44eps)

differences
- the untamed is adapted to be more of bromance/friendship while handsome siblings is just twin siblings separated at birth scenario
- in handsome siblings, the ml find a female lover

as someone who has watched both, i personally prefer The Untamed bc the plot is more int to me but handsome siblings was good too actually