Peerless Dad is excellent. It starts off with a trope (secretly high-potential martial artist) and gimmick (but he has triplets). But, unlike others which fizzle out once the gimmick gets old, this one actually gets better because of its main gimmick. (the MC being a dad).

The MC is competent, knows his limits and navigates a complex class system to set his own children for success and safety. And then it has its badass moments to bring it all together, which is far more rewarding with the time it spends doing the 'boring' groundwork.