苦海茫茫

sea of bitterness is vast (idiom)

bitter / hardship / pain / to suffer / to bring suffering to / painstakingly

lit. sea of bitterness / abyss of worldly suffering (Buddhist term) / depths of misery

surname Hai

ocean / sea / CL:個|个[ge4],片[pian4] / great number of people or things / (dialect) numerous

vast, with no clear boundary / fig. hazy / indistinct / unclear / confused

boundless / vast and obscure