If u like this drama you will surely love 'falling into your smile' too.. actually for me it is way better than this... i am sure if you give 9 points to ths drama u will give more than 9 to FITYS...
All supporting cast in falling in to your smile really shining than this one.. i love this drama too but overall FIYS is best

When lee gon come to save tae eul with his peopl it gives you same vibe that kim shin come to save eun tak with grim reaper..

N there r few more similarities.. if u love king u will ddefinitely like gobling... for me gobling is better than king

both dramas story going around apartmnt... hapiness have illnes called ' mad man illness' it made peopl zombies but they become back normal,, sweet home also have ilness but that is not zombies they are become bad creatures but they can not come back normal..

Both drama have 1 human tht can control ilness.... in happiness it is Sae bom n in sweet home it is hyun soo.. in the end both dramas show their r 1 more humans with antibiotics ..

Both dramas has same vibes. n give you same thriller feeling.. if u like happiness drama n the way it happening u differently love to watch sweet home.. for me sweet home has 80% more feeling than happiness.. n sweet home is scarriest becoz when u watchd happiness u did not feel mor scared and more sad tht becoz u know they can become human again but in sweet home it is not like tht u dont know when u become monster and when some one died it feel more heavy..

So if u like this just try sweet home.. make sure you have tissue becoz it is going to make u cry your eyes out.. Did you cry while watching the Happiness? Then you should definitely keep the tissue if u plan to watch sweet home..

The way yeon wait for his girl is like goblin wait for her bride. And you can find few more similarities.. but this one not perfect as goblin ??

Both are office love.. director and secretary love.. both dramas have two directors who love same secretary..