Is it cos i forgot the previous season or did meokyeon change personality

They wanted to portray him lost and miserable with frail look now they have forget the objective and made him into a frail crybaby bottom

he totally did

He had a mental breakdown, tried to kill himself, passed out drunk, got hospitalized and Nanjo jumped on him when he barely got home from the hospital. Give him a break, he won't be always like this but probably not the same as in s1 either because that was Mok not giving a shit about anything, now he does.