The hashtags on the poster say #BossySister, #DemonBrother and #PerfectBoyfriend, but do the Brother of the Year leads Nichkhun, Yaya and Sunny deserve these epithets in real life? As we found out, Nickhun is the #ObsessiveGoogler; Sunny is a #NeatFreak and Yaya is the #CoddledChild. Thai-American heartthrob Nichkhun Horvejkul was in town on Monday, speaking to media alongside director Vithaya Thongyuyong and co-stars Sunny Suwanmethanont and…