When I do it with just my body, I do that too, haha.

omg saaaaammmeee! Haha

If you lay a towel on your back, it won't make a sound~

The text "ㅇㅈㅋㅋㅋㅋ" is a Korean expression. "ㅇㅈ" is an abbreviation for "인정" (injeong), which means "acknowledge" or "agree." "ㅋㅋㅋㅋ" represents laughter, similar to "lol" in English. So, the translation could be interpreted as "Agree, lol."