After seeing the Black and White’s subway billboard today, I wanted to know more about this culture of publicizing ships in Korea, so I started to look into it. Here’s a summary of what I found (check thread for details). All sources will be cited. +
K Pop Metro ads are very commonplace

BTS had the most metro ads of any K Pop group

Jungkook had the most Metro ads of any K Pop idol

Ads are taken out for birthdays and anni

Entire trains have been decorated as ads

Jikook anni ads go way back

There are also Taekook ads

+
BTS holds the record for Metro ads at 227.

Jungkook as the idol with the most individual billboards, with 46 ads.

BTS& #39; V with 31 ads.

https://www.sbs.com.au/popasia/blog/2020/04/08/10-k-pop-artists-most-fan-bought-seoul-subway-billboards-2019">https://www.sbs.com.au/popasia/b...
Jimin& #39;s fansites go all out for his birthday, setting records!

First Idol in Korea whose birthday support that involved ALL 702 PDV & LED &DID screens in all routes & stations of Seoul Metro in 2019.

https://twitter.com/JIMINBAR_CHINA/status/1160192550944137219">https://twitter.com/JIMINBAR_...
Jikook / Kookmin has been celebrated for several years in both Seoul and Busan.

https://twitter.com/BAIDUkookminbar/status/997116435812896768">https://twitter.com/BAIDUkook...
For the 6th anniversary, a fan site took out ads in the subway, put up flags on the street and even put ads in the airport.

https://twitter.com/BAIDUkookminbar/status/1131197386112372737">https://twitter.com/BAIDUkook...
I found other "ship" ads too: Taegi, Sope and several Taekook.

https://www.pinterest.ie/pin/304485624802005995/
https://www.pinterest.ie/pin/30448... href=" https://twitter.com/ByMySide_KookV/status/1133498983270297600
https://twitter.com/ByMySide_... href=" https://twitter.com/anjeljimin/status/1192350623368282112">https://twitter.com/anjeljimi...
The interesting thing was the responses that some of these ads got. I will let you form your own conclusion but here are some screen shots from a Taekook ad.

https://twitter.com/pls_9597/status/1190038590807584770">https://twitter.com/pls_9597/...
Compare this to the responses from Black and White& #39;s most recent Jikook ad.

Why do you think people responded so differently? (All the Korean translate to positive things like thank you or beautiful.)
I can& #39;t really draw a scientific or absolute conclusion from this but I think it is an interesting observation and I wanted to share what I found. You can draw your own conclusions and if want to chat, feel free to DM me.

Here are some other ads I found just for fun.
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