Finally I succumbed to my dad's recommendation, I bought a microwave.
(Dad: it will make your life easier!)
So I picked the cheapest one sold, a simple 21 Litre LG microwave, 1890 baht.
The best thing about cheap electronic appliances is the it gets simpler when it's cheaper.
Just followed the unpacking guide: unbox and plug it
Done! Now I have another "human invention of the century" in my room!
ps. I'm a bit surprised that the interface isn't bilingual, although it is simple and intuitive enough 😛