This one might be tough (or maybe not):
10 dramas (or rather pairs of dramas) that aired with an actor/actress who had another drama airing at the same time (complete overlap not necessary, but at least some air dates overlap.) Based on MDL air dates. Does not have to be a lead or even a main character. So this will require pairs of dramas. Could be more than 2, if there are any. Please name both dramas and the actor/actress.
1. Our Interpreter and My Boss - Chen Xing Xu
2. Love Song for Illusion and Like Flowers in Sand - 2 actors overlap, Hwang Seok Jung and Woo Hyun
3. A Good Day to Be a Dog and Marry My Husband - Cho Jin Se