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Sulli uploaded a capture of the chat she had with Heechul on her Instagram, and the chat messages indicate that Heechul was direly craving some spicy hot dogs late at night/very early in the morning. And for some reason, Sulli was one of the people he reached out to eat the delicious, spicy hot dogs together next time. 

The messages read:

Heechul: "Child, do you like spicy food?" 

Sulli: "I love it <3333333"

Heechul: "Oppa really...there is this crazy spicy hot dog place?? I just ate there by myself now..let's eat together next time. For reals..so spicy"

Sulli: "lololololol you eat something that spicy all by yourself so late at night? lololololol they must be open late? let's go let's go"

Heechul: "Yes let's. I ate all alone like a loner.. ??"

Netizens reacted to this back and forth between Sulli and Heechul, writing, "The biggest hot dog (choi-kang hot dog) is probably always warm so why does she need a different hot dog.." "She obviously had a fight with Choiza and uploaded that to make him jealous lolololololol," "Spicy hot dogs at three?? in the morning??" "She won't eat it if it's not jumbo-sized!" "I would be angry if I were Choiza. No matter how close you are, texting another man's woman at 2:47 in the morning?" and, "They're close so they can [message each other] lolol do you people only message your boyfriends? lolol"