1) Seohyun and Luhan's position in their groups are lead vocalist and lead dancer. 2) They both room with and are close to the main dancer in their groups, Hyoyeon and Lay. (This is kind of off topic but, Hyoyeon and Lay have stuff in common too: They are the main dancers in their group; they both are the funny ones in the group; they are the ones who cook for the other members) 3) They both like white. 4) They both have a cute face and shy expressions. Also, Luhan said his ideal type is a quiet and demure girl. Seohyun is that and so much more. He also stares at her a lot at SM Town concerts. If you check out some fan cameras on Youtube, you can see that he glances her A LOT! And you can see that Minho (from SHINee, who said his ideal type from SNSD is Seohyun) acts like he is really close with Seohyun, especially around EXO. Watch those fan cameras on Youtube, it is not a coincidence that everywhere he looks, Seohyun is there, and that Minho acts close to Seohyun, and EXO, or Luhan, is coincidentually there. Whoever said that his favorite member from SNSD is Yoona, is a liar. Yoona is not quiet. No one knows if Seohyun likes Luhan though. It seems like she likes Kyuhyun from Super Junior.