Second male lead syndrome is when you like the Second Male Lead more than the Male Lead.
The Heirs - You like Choi Yound Do more than Kim Tan. You got second male lead syndrome.
" OMG ! I feel so bad for the second male lead! #secondmaleleadsyndrome "
noun
1. disease developed where you like second male leads in k-dramas
2. personality trait where you have difficulty making choices
Not you asking the person with second male lead syndrome to decide...