Really hard to choose but I'd say the scene where Sumo says something along the lines of "Ek Baar dost keh diya toh keh diya. Said. Done. Sealed."
Also the recent episode before the party fiasco. Shravan being the gentleman and noticing Sumo ke anger ka tareeka.
And when she says "Nakhre uthane padenge" He replies with "Utha lunga"
I thought that was really subtle yet realistically romantic.
It's embarrassing how many times I've rewatched that scene 😆. Mohit's dialogue delivery in that scene would make any girl melt lol ☺️