Not sure how the sponsor abusing Hae-yool is a lie. We literally saw the sponsor being abusive out of jealousy. It wasn't staged, he wasn't onto whatever plan. He was genuinely aggressive and forceful. It's not a lie and I doubt it was the first time. How did Hae-yool plan he was going to get assaulted (how could he plan that Seo-in would follow him and sponsor bump into them at perfect timing???) and how could he plan Yeongwoon to magically arrive in the middle of the assault, he didn't notify him in any way, he genuinely looked angry in that scene, we saw his thoughts ....?
He lied about the reason he was being assaulted but it's not a lie he was assaulted. He only used the assault part in his advantage but the assault was real.