TS Entertainment's newest girl group SONAMOO celebrated their 100th day since making their debut with edgy hip hop track, "Deja Vu"!

Each member personally wrote a long (and I mean long) letter that they then proceeded to beautify with cute drawings and coloring. �It looks like they went back to their kindergarten selves and had fun with it!

The girls cutely go on about how "unbelievable" it is they've made it to their 100th day and thank their fans fervently for all their support, such as mentioning the group on Twitter, writing on the fan cafe, and going to the music shows early in the morning to see them.

Congratulations to SONAMOO! �They're a group with a lot of promise, so keep watching out for their future activities.