Up against "Love Again" by Lim Chang Jung, "4 Walls" by f(x) nabbed its first music show win on "M! Countdown" merely a week after dropping the song. The win was significant because it came after a trial-filled period for the now four-member group.

Feeling the love of their fans and their sacrifices paid-off, Krystal and Luna shed tears during the awarding. Leader Victoria stayed collected and thanked the fans. Amber was about to burst into tears but did her best to keep on singing.

Fellow SM artist Key went to the girls to embrace them, reports AllKpop.

On Oct. 26, f(x) came back as a musical group, following a challenging hiatus, where it lost its visual Sulli.

For a while, fans have been wondering about the future of f(x), whether they can push through with four members. People kept a close eye on Krystal, curious if she will remain at SM Entertainment after the exit of her sister Jessica from f(x)'s sister group, Girls Generation.

Followers were relieved when SM finally announced a comeback date for f(x), but the flow of good news didn't stop there. In the last week of August, f(x) amazed fans by coming out as a much stronger group with more challenging choreography and much-improved vocals.

Shot on the mystical Jeju Island, the "4 Walls" music video recieved praised for its unique and seamless music and refreshing storyline.

During the group's performance stage, the members grooved into a challenging choreography, which showcased their dancing prowess and blended perfectly with the sweet, mid-tempo song. Even the outfits were well-conceptualized and iconic. No wonder they bagged that "M! Countdown" trophy.

Moreover, f(x) gained a second trophy on the following day at KBS Music Bank. f(x) is also dominating Gaon and other Korean and international charts.

f(x) is nominated in several categories in MNET's MAMA, a very important recogition in the Hallyu scene.