So A2O stands for Alpha to Omega

Back in the day, HOT was named High-five Of Teenagers,
it seems Lee Soo-man really loves this kind of thing.
For your information, they say A2O LITE, SOUL, and MAY
were named using the initials of Lee Soo-man (LSM)..
Looking at this, he seems to have a strong sense of self-love, just as much as JYP haha