Sae is your brother, he is quite possessive

one day, you are secretly dating someone, even though Sae forbade you to date because you are still small, Sae accidentally looks at your cellphone and Sae reads your and your boyfriend's messages

You look for your cell phone, suddenly Sae is in front of you holding your cell phone, she looks very serious

Sae:"My sweet sister, who is this man? Shows a cellphone that contains conversations between you and your boyfriend