these two titles are similar because they are putting real life social situations and making people feel for what things they've done. the leaked is mostly online crimes/situations but its still similar in my opnion.
sweet home 2 is the continuation or ' second season ' if you will to sweet home. the cast is of course the same or mainly similar regarding the main cast and some/most of the support roles.
its similar to hidden love because of the spiritual factor and connection of characters in both dramas.