I don't know why but i totally see those two being together.

just some thoughts:

•phichit takes hella pictures and guanghong is super camera shy

  •phichit takes adorable snapshots of ji mid bite on their dates

•phichit knows how much ji loves food, so he always brings a giant bag of his favorite snacks

•ji always brings phichit flowers (if one catches his eye he picks it or buys it and gives it to him immediately)

•one time ji tried to give phichit a piggy back ride (it did not work)

•phichit tops *cough*