Both have...
- one family with only daughters, one family with only sons
- several romantic relationships
- both families live next door
- male divorcees in love
- elders own family business
- lots of fights between two families

Both have...
- the same screenwriter
- a variety of office/co-worker relationships
- simple but sweet and light hearted plot
- several people with different personal struggles
- Big and younger "brother" fall in love with the same girl
- KIM WON HAE

*edit*
Drinking Solo Cameos....