similiarities:

--same writer!
--group of friends who have a dream (music as opposed be a writer, actor, videographer) but have a day job to help make that dream become a reality (cabbage farmers vs. guesthouse
--family = friends
-- the funny!

similarities:

-- centers around a group of friends that are more like family
-- instead of a guesthouse it's ramyun shop
-- quirky characters ALL ROUND

differences:
--focuses more on romance that waikiki and there's a main couple where as waikiki gives everyone equal screen time
--a little bit more emotional heft--not that waikiki doesn't have that but it's dealt with differently

-time jump dramas where the heroine is taken from present day/modern korea back to the past
-both have a light and humorous tone

If you enjoyed My Only Love Song but want something with little bit more depth and emotional angst (not like crazy tragedy, just enough to hook you in a little deeper) Splash Splash Love is perfect for that :)