Gahi's failing solo career has lead her to drink.
< insert "drinking semen" joke here from every male on this site >
Look at her face though. Her eyes look terrified of that drink. Kang Min Kyung's (Davichi) tongue says, "yes - anything for the job"; but her truthful eyes say, "no, not again! This is the fourth time today that I have had to stuff this many balls in my mouth!".
Disgusting fans have left multiple comments such as (all of which are made up):
"I wish I could drink her milk."
"Put my balls in your mouth, noona!"
"Heh, heh. Don't choke on my balls!"
"This is a drink she loves? Minkyung, you are always welcome to sucking on my balls and drinking my milk from my straw."
"I enjoy milk bubble tea as well."