The wedding invitation dinner + buffet costs over 100,000 KRW; how much should I give as a wedding gift?

‌I have nowhere else to ask this, so I'm feeling a bit stuck.
I met this person through a running crew, and we've known each other for about 3 years?
Since it's an online crew, we only see each other's faces about three or four times a year.
We had a wedding invitation dinner, and it seems like it cost more than 70,000 KRW per person just for that.
Since the wedding is in Seoul and includes a buffet, the total cost including the invitation dinner will easily exceed 150,000 KRW.
We aren't that close, so I thought 100,000 KRW for the wedding gift was already a lot,
but after calculating the cost of the invitation dinner plus the buffet, 100,000 KRW won't cut it.
Yet, we aren't close enough for me to give 200,000 KRW.
If I give 150,000 KRW, I wonder if people even give wedding gifts in that specific increment,
and it also feels like I'm making it too obvious that I'm just calculating exactly what I ate.
Since I am in my mid-40s, I've been married for a long time, and since none of my friends have gotten married in the last few years,
I'm not really aware of the current market rates.
In this case, which is correct: 100k? 150k? 200k?