^Their color is Pastel Rose in the shape of a heart. Similar to CSJH's color, S♡ne actually asked to Shapley (CSJH's FC) to chnge their color since is similar to SNSD's but thats stupid if you ask me, why the seniors would change their color, in any case, it would be S♡ne the one who should change their color. Anyways, SM has the fault for choosing pink, SooMan knows that could bring trouble so, idk why he didn't choose any other color ROFL, this is causing troubles with ELF, Cassi & Jumping BoA again since fans have no right to ask the senior FC to change their color, hope this doesn't causes trouble =___=, it would be a shame since, I do find difference between Shapley's color and S♡ne's color and also, S♡ne's balloon is in the shape of a heart, is way too different to CSJH's.
As for your question, Soweon is somewhat pronunced in english like "So One" so, that's why is S♡ne.
I know! Is gonna be colorful. Cassi with Red, ELF with Sapphire Blue, Jumping BoA with Yellow (only in korea though), Chocolyn with Mint Green, Shapley with Pink and now S♡ne with Pastel Rose in the shape or a heart & SHINee fans with their Baby Blue!.