I usually don’t get second male lead syndrome, but honestly? The main lead (ML) is a complete idiot. He can't see that the original female lead (ogFL) is lying to him, trying to seduce him, and attempting to replace the current female lead (FL). He doesn’t try to understand FL. He always pushes her away but panics if she seems like she’s actually going to leave. He’s exhausting to love. How can a prince have so little awareness?
The second male lead, on the other hand, understands FL, supports her, and doesn’t try to hold her back. He just wants her to be happy. He’s her childhood friend and genuinely cares for her. He doesn’t interfere with her relationship with ML but asks her what she needs to be happy.
Let’s leave ML behind and run off with the second male lead. ML can keep his regrets.