Same strong healthy, unwavering relationship between the main leads. No stupid misunderstandings and break-ups. Very cute and fluffy!! In Love O2O, male lead chases female lead, but in WIFTY, it's the other way around. No second lead syndromes. Love O2O takes place in uni entering society, and WIFTY starts from high school.
I haven't finished PYHoMS yet because it is still ongoing, but from the 8 episodes I have watched already, they are both very light hearted, fluffy and heartwarming! The main characters have unwavering love for each other. Both includes college life and has very smart male leads. Although the girl is not as smart as the male lead, but still very smart because the male leads are geniuses that can't be compared to... The personalities for the main leads are so sweet and cute too.
They are actually sister dramas! All based on the same author's novels too. Although "Put Your Head on My Shoulder" is still ongoing, I liked every episode of it so far (even more than "A Love So Beautiful". They are both so heartwarming (especially PYHoMS) with great character developments and include school life (with PYHoMS starting from college and ALSB from high school). If you liked one drama, you'll like the other. Both are very light and you will find yourself with a big smile on your face after every episode.