Those series are of different genre completely, so proceed with caution.
Similarities - in both series one of LMs - a young boy, lacking mother figure (Papa & Daddy) or missing his mom - you can imagine level of cuteness and situations.
Then, there are big differences - Papa & Daddy - lgbtqi series, like exploration of daily challenges of gay couples, Light on My Lion - it is more a thriller and found family, yes - with male family members only, and nothing else.

Japan just did it again, killing us by kawai level of level - infinity! Actually, havent seen such series from other countries?
Both dramas are centered around 5-6 yo male leads, both - escaped from parents in one way or another. So, as can be expected, they bear some trauma and act like adults in some situations. Still, both series are cute, with some detective plots, but mostly - hilarious daily situations

Japan recently introduced a lot of series around male families only, be it 1 or 2 generations, not bl - just ordinary single parent/sibling.
Four brothers - speaks for itself - daily routine and hilarious situations of four brothers, the youngest being 5-7 yo , the eldest - supports family
Lion - similar plot, oldest brother support autistic younger brother, then Lion jumps into their life, destroying order and wreaking cute chaos.

Level of kawai - too high. Both series explore mundane days of families with no mother figure, in both - brothers dedicated themselves to younger siblings upbringing. In both we have young cute boys, hence kawai - you cannot not smile .
Our dining table is more on bl side, though not explicit, Lion is more a thriller , mostly around family.
Just realized, both are japanese,

Both are bls, though with different plot, I felt very strong similar emotions, on the brink of sobbing. It is hard but rewarding watching, I saw in both series that is won't go ok and happy ending is under the question, at the same time the journey itself , like in real life, is beautiful. While Peach of Time (korean with thai actors) and a ballons landing is Taiwanes, both executed well, with stunning actors. Love like a breeze, be in the moment, enjoy the moment- it won't last forever.

Not sure why, but series have similar vibes, human relationships outside of any particular genre, dementia in Navillera, autism Light on my lion. I am happy I found both shows, how did I encounter them - no idea

I had similar feelings, somewhat incompatible from the first sight boys (men), who fell at each other.

It was intriguing to follow chinese bl evolution, while like love was quite explicit, it was lacking chemistry, advance bravely only implied relationship, though chemistry was all over the board.

Similarities are big
Both are chinese school slice of life dramas
Roy Xie took part in both of them
While WIFTY is about ml/fl couple, the second is on a bromance side, both shows life of multiple friends

Both cbl
Both censored bromance
Complicated stories
Tangible chemistry between MLs and no GLs
Well produced dramas, emotional, with incompatible MLs (from the first view)

Both are bls, some sad moments, a lot of the plot about singing. As given is jbl, it is more straightforward in terms of bl relationship. TBF covers a slice of life and longer period of time and multiple couples

Both dramas are BLs, high production value, mafia and gangs. Casts are superb. Plot - from enemies to lovers.

With some similar traits, dramas left me with similar feelings. Meow- korean straight drama with a cat able to appear as a man, suki - more on BL side, with a dog, which reincarnated as a man. They enter and change leads' lifes, though how long they can stay?