IDK why but Lee Know And I.N got me confused for the longest time. My Twin Gets Seungmin And Woojin Mixed up. I Personal Don't See The whole Suga and Woozi Thing. I Get YangYang, Hendery, And Xiaojun I have no idea why but i do. Taemin and Jungwoo just a little. And for some odd Reason I got Wooyoung and San mixed up.
not enough to say they totally look alike but i think they favor each other
i noticed in Monster that Irene sounded similar to Taeyeon also. It's probably because they have the same vocal teacher (ya know sm) I notice it when Irene hits higher notes