LOONA and Ryan Jhun have dropped their music video teaser for "Not Friends".

In the dramatic MV teaser, HeeJin walks across a table as she points and shoots a gun. "Not Friends" is the second single of producer Ryan Jhun's ongoing music project 'MAXIS', and he's collaborating with LOONA members HeeJin, Kim Lip, JinSoul, and Yves.

LOONA x Ryan Jhun's "Not Friends" drops on September 3 KST. Check out the MV teaser above, and let us know what you think in the comments below.