The source is interitio's twitter, but from the comment

Interitio said:

RT 이벤트로 받은 아스카 랑그레이! 흑흑 아스카 좋아요 ㅠㅇㅠ 아스카.. @real_heejo

I can't tell if he drew it or was retweeting someone else's work. Anyone here read Korean? The picture came in the middle of a conversation between Interitio and @real_heejo on Twitter.