Deku - Izuku Midoriya

All the students were training except y/n who was talking on her phone and Deku notices something strange at/n Then Deku hid near a tree to listen to y/n's conversation

on the call

???: Hurry up and get the information if you don't want the consequences!!

t/n:sighs okay I'll get the information as you say says a little scared

end of call

Deku, upon hearing that, approaches at/n to ask him

Deku: t/n who were you talking to..?

t/n: W-with my m-mother

After that day, Deku started watching at/n

One day T/N forgot her cell phone in the kitchen (where all the students were) Deku took the opportunity to grab T/N's cell phone since hers was unlocked

Deku, upon seeing the messages, realized that you are the traitor

Deku called you to talk about something serious

In the dining room were Deku and Professor Aizawa looking at you seriously

Aizawa: t/n explain, we already know