Chingu or Oppa?

When I told the gang about the package from Rin to Oppa, we are so confirmed and confidence about how Rin felt about Oppa, but Oppa still denied it all. He told us that they are just friends, like best friend or in Korean he called 'Chingu'.

Wiko : Now you tell me one female friend that gave you something special for your birthday. 

Oppa : I got a friend from Univ who did the same. She also got me something for my birthday

Me : Yeah, but tell me one female friend who always chat with you on day and night.

Oppa : Well, because she chat me first and then we talk something we both like and then it goes on. I also got a friend in University who did the same. 

My Brother : How can you be so sure that she also considered you as her 'chingu' not 'oppa'?

Oppa : Because I just know. she is my chingu.

That night we know that Oppa is one of a kind who think that a girl would gave present and chat with him all day and night because she is bored and don't feel anything about him. Yeah, we got you Oppa!