We'll be lucky if it's a delusion. But given FMC's insecurities and the like, I wouldn't be surprised if it happened. However, MC/FMC relationship being childhood friends is a curse (IMO), as in their case, they are always wildly competitive and in other cases, the friends don't want their relationship to change or go up to the next step. And up to 15, it looks like MC spills his heart out in a maybe confession? We'll just have to wait and see for the translations to get full clarity. Ooof.