What is the most successful Loona song in pre debut era?

[Bosnia_HyunaLover <3]

In terms of digitals on Melon Chuu's song Heart Attack has over 10k likes and is the only song of Loona to do so

It's even more popular than the units

 

In terms of YT views Jinsoul has the most views on her MV

 

In terms of physical sales their last unit has the best sales (18k+)

[Whisper]

Chuu - Heart Attack 

[Haêra]

eclipse or singing in the rain 

[jeonsbegin]

it's what the best solo deserves 

[solis]

Heart Attack

[ddududdudu]

in my heart, every song is succesful ♥

[Loonathehoe]

HA did that