Cirrus Baek

When he learned that Skylar was taking photos of his friend, Seong Chan-il, he thought about informing his friend, however, he became curious about Skylar, due to the fact that Skylar is gay. He was able to get Skylar to trust him under the guise of promising to not tell Chan-il of the hobby. However, he used this trust to harass Skylar, which Skylar ended up realizing all too late. Cirrus later made a deal with Skylar; Skylar will do whatever Cirrus asks of him, and he will delete however many photos he feels necessary.

(Source: Yaoi Wiki)