Thank you all.
Since mine is a built in oven, so it's too big and waste of energy to re-heat 1-2 breads in the morning.
I used mircrowave, but the effect not that good.
I used airfryer for 180-degree about 3-5min, but no good too.
Now I use the mircrowave for 30 sec, then pre-heat the microwave with grill function, then grill the bread for few min. effect is ok, but rather long and clumsy.
Remember some JM mentioned their airfryer is good for re-heat bread, so wanna see if anyone could help la.