MiningPoolHub(MPH) is very well-known in South Korean and MPH contact/support point in South Korea is the ddengle site. (https://www.ddengle.com/pool_mining_pool_hub)
Ddengle is the largest miner community in South Korea since 2013, ESN(EtherSocial Network) was incubated several years ago at the Ddengle.
I guess that's why ESN is listed at MPH