“mOS 2.74” is the sixth digital single by Minseo. Minseo (민서) is a South Korean singer and actress under APOP Entertainment. In 2015, she participated in Mnet’s audition show Superstar K7, finishing in the Top 8. She officially debuted on March 6, 2018 with the single “The Grand Dreams”. She is a member of the project group TEAPARTY under the name Ria (리아). TEAPARTY (티파티) is a three-member fictional project girl group under JH Entertainment. The group was created for the KBS2 television drama Imitation. Previously on May 8, 2021, they debuted under the name OMEGA III (오메가쓰리) with their debut single “Call Me (8282119)”, but disbanded on the same day because of their pre-debut member scandal.