The text "ㅅㅂ" is an abbreviation in Korean that stands for a profanity. It is often used as an exclamation of frustration or anger. In English, it can be translated as a vulgar expression, but it is not appropriate to provide a direct translation.
15cm 앞을 보세요
글 멋지게 쓰고 33일 운동하고 끝났군요...
I'm dying, damn it.