f(x)'s Luna shared how Amber reacted to her solo comeback.

On January 10, Luna guested on SBS Power FM's 'Kim Chang Yeol's Old School.' The idol explained she wants to give encouragement to those who are tired of living with her new song "Even So."

She also shared, "Amber contacted me after I made my solo debut. She told me, 'Stop trying to be sexy. You are too revealing.'" Luna added Amber is a caring friend who constantly monitors for her. 

Luna expressed affection for f(x), saying, "I feel like I'm going to cry saying this but you know f(x) members are all busy promoting overseas but they all contact me and care for me when something happens to me. I'm so grateful."