How to save money in South Korea

Hi! I moved to Korea about 2 yrs ago on a scholarship 900,000 won a month.  I made 2 promises to myself before moving there 1) not to go over 900,000 a month (during those 2 yrs i only went over budget only 3 times, the month i first move 2 korea, my first birthday in korea and the month I moved to a new apartment near itaewon) 2) to keep tract of every cents i spent.

Tip:  from a broke student perspective
1) If u a student live in the dorm at least for a while and save-- dorm are usually way cheaper than living  outside.
2) don't really look at housing in craisglist- i find the price ask to be higher than average
3) I heard buying groceries/ fruits are cheaper at traditional market but to be honest I would not know. Homeplus is the first supermarket that i went when moving to korea and I kindna stick to it. they always have deal.
4) foods/drinks in itaewon are overprices avoid if u can
5) get a t-money card
6) take taxi only in case of emergency.
7) cooking your own food is not necessary cheaper than eating outside (korean food)
8) love drinking-  hit the convenience stores with ur friends. way cheaper and gs25 also have cheaper fried chicken.
9) check out daiso/gmarket
10) shop at underground shopping instead of department store