Girls' Generation's Taeyeon and LE SSERAFIM did the 'ANTIFRAGILE' challenge together.  

As LE SSERAFIM recently came back with their 2nd mini-album 'ANTIFRAGILE,' the group has been collaborating with different celebrities to promote their song. This time, they collaborated with Taeyeon after filming their episode of 'Amazing Saturday.' 

Netizens reacted: "I love this collaboration omg"

"I can't believe all my bias are together in one frame"

"Taeyeon really shows she's more experienced. The ultimate sbn moment"

"Can Taeyeon release a full cover of their song? Please?"

"Aw LE SSERAFIM being shy is so adorable lol"

"Taeyeon's facial expressions... I'm speechless"

"I haven't listened to this song but now I'm adding this to my playlist. I guess this is why everyone is rushing to do song challenges"

"Yunjin is now a successful fan lol I remember her singing Taeyeon's song during Produce"

Check out the challenge video above. What do you think?