Do you know who are the infamous 'Chaerin's oppas'?

2NE1 CL has 'self-claimed' oppas and they are none other than Big Bang's G-Dragon and Taeyang. Taeyang has been posting photos of him with G-Dragon and captioned them with 'Chaerin's oppas' making fans wonder why.

Today, the two dorks posted a photo of them again and wrote, "Also today, Chaerin's oppas #oh op-ppa". In Taeyang's photo, both of them are making funny poses while wearing stylish outfits for their concert.

What can you say about 'Chaerin's oppas'?