There are various instances where this has been proven:
1)The very first takkar near the bus....Su kept on looking at KK until she said 'ab uthoge bhi..aur uthaoge bhi'!!😆😆😆...it's like he stepped out of a trance when she spoke...he was so mesmerised by looking at her☺️
2)When he spoils her painting,he looks like he's about to cry just coz she's upset & crying😭.....then he even says sorry coz he knows he made a mistake...
3)When he sees her state during the bhang thingy,he removes her from the pond,takes her to her room & ensures she's fully protected,covered & free from any more harm😉
4)In the jungle,when he wakes up & she's not there,he gets tensed & searches for her everywhere...when he finds her,he even says 'tumhare liye kitna pareshaan tha'☺️
5)when they're separating,Su's look says it all!!!!he's looking at her as if he can't sort out his feelings...he wants to hate her,but his heart says something else altogether☺️
There are various more scenes,but I think this post is long enough!!😛