I've done the research and have found different numbers for avg and median household incomes, but what i have found vary a great deal. 

We are a family of 3 (1 year old child) and i feel like our household income should be more than satisfactory...but it feels a little tight. I'm admittedly a free spender though. So i have to get that under control.
I'd like to move to a newer apartment, we
currently pay 1.1 million/mth, and lease a car....but it just seems too much. I think it would leave too little for saving/investing and leave us house ridden. No eating out or going on vacations.

Sincerely wondering what most would consider a "decent" household  income for a family of three?

Leasing a car doesn't usually make sense unless it's for business and can be written off.

Don't forget to include education expenses. Those can really add up.

Average income figures may well not tell the whole story in Korea, where financial help from parents is so common.

YMMV, but I would say 2.5 million in the described situation allows a comfortable living. That does not include housing, be it rent, mortgage payments or jeonse loan payments. And car payments. I mean maintaining a car and fuel etc yes, but not monthly payments on the car itself. + ideally some saved. All in all, 4.5-5 million would allow a comfortable lifestyle and at least a million put away every month.

A toddler doesn't cost a lot of money. But then again, it depends on who you're asking. One can buy a single piece of clothing in a department store for 100k or that same amount would buy a large bag of perfectly good second hand clothes.

If anything, you should work towards reducing your rent and not increasing it. Better yet, aim for jeonse. You would qualify for a cheap, newlywed loan. Just guessing but I think you could find one with 3.5% interest these days or perhaps even around 3.
200 million at 3.5% is under 600k a month. And you only pay the interest. You can borrow 80% of the jeonse.
Or even better, get a mortgage. It's a buyer's market now. But for that, you would need a higher amount saved up.
While you are renting, don't live in an apartment. Either jeonse or weolse for the same size, will be significantly cheaper on a villa. Not only that but the maintenance fees are much lower which also allows you to save more.

Sadly, an English teacher's income won't let you live this "middle class" dream in Seoul. 

As far as I'm concerned, if I can't afford to go to a decent wrestling gym with a good locker room, it's not enough.

Well jump onto crypto while you can. 

Funny you should say this. I'm involved in crypto and now is certainly the best time to get involved.  Wish i had more money at the end of each month to invest with

Koreans banned foreigners in Korea from investing in crypto. Why? Partly because they were jealous foreigners were making money from arbitrage. Ironically, arbitrage brings down prices for Koreans.

Yeah, rather than it being some violation of an archaic financial regulation, it must have been collective jealousy towards those darn foreigners. That must be why. 

It's likely that it was Korean nationals moving the large amounts of on-ramped KRW through the different exchanges, not foreigners.
It was lucrative back in 2016-2017, since iirc crypto had something close to a 20% markup on Korean exchanges.

Koreans banned foreigners in Korea from investing in crypto. Why? Partly because they were jealous foreigners were making money from arbitrage. Ironically, arbitrage brings down prices for Koreans.

Racists.  Anyways, I just saw that Nonghyup bank wont transfer large amounts if it came from crypto.  SO, maybe it's just as well.  Use Coinsmart from Canada and Coinbase if American.  Coinsmart lets use use Interac transfers in Canada and Coinbase will let you use credit cards if American?  I buy bitcoin via these and send to FTX via bitcoin wallet transfer.  Then, I sell and change to the other curencies or coins I want.  Someday, I will sell them and reconvert back to BTC and then flip over my BTC wallet on Coinsmart.  Then send to my bank.  I would have stayed on the North American exchanges if they had XRP, XRPBULL, and SHIBA INU (and a couple of others).  Sadly, they don't.  So, I have to use a couple of exchanges. 

Glad to be done with Korea and have nothing to do with them, now.  If you are married to a Korean you can fund BTC wallet here and then transfer over to FTX or another offshore one with more coins if you wish.  Can also send those coins directly home when they rise rather than dealing with Korean regulatory nonsense. 

4.5mil won a month. So about 2x an E2’s wage! Poverty line is like 2.1 mil won