Sulli's cover got blown only one episode into the new series.

On the August 15th broadcast of SBS 'To The Beautiful You', Kang Tae Joon (Minho) agrees to use the same room as Goo Jae Hee (Sulli) if she puts in at least one goal during a soccer game.

Goo Jae Hee ran with all her might to try and score a goal, but fell and hit her head after being shoved by Song Jong Min (Kwanghee).

The school's doctor Jang Min Woo (Ki Tae Young) who took a closer look at her condition informed Tae Joon and Eun Kyul that Sulli's character was breathing normally, and a concussion had caused her to temporarily pass out.

However when Sulli awoke, Jang Min Woo looked towards her and said, "Are you awake? You passed out during the game."

Getting to the point, Min Woo then added, "But it's strange. Why is there a female student at an all-male school?", revealing that he knew the truth about Sulli's identity, and adding further suspense to the story.

Source & Image: Newsen via Nate