Not gonna lie, this kind of brother-sister relationship is pissed me off.
The author makes us the reader to accept a likeable brother as the male lead: just because he always there for his sister and unknowingly flirty and a romantic partner potential.
What is this? Marmalade Boy modern ver.? Nope, I'll never join this hype of thirsty "the brother's such a romantic!" yell.
God, god, godnesssss...this is the first time I fully support the 2nd ML with all my heart. Just because he gave unfriendly attitudes in the beginning, it made him miserable even more when he slowly, hesitantly approached the FL even he knew he didn't have the chance. Seriously, he's just tooooo good, too kind. There's a sincerity in him. He's not forced his way out of the FL.
The FL ended with the 2nd ML is the best ending and more realistic.
I'm seriously gonna drop this because I know what's going to happen. Yeah? The ML is the end game. You don't have to tell me.