Both are about a family dealing with the loss of a patriarch/matriarch and the secrets that come out after their death. Lued Khon Kon Jang is more of a murder mystery involving a large family while All Is Well is more of dramedy about a dysfunctional family. Both touch on the preferential treatment of male siblings over female.
Please note that these two dramas arent from the same country and these are all I remember from in family we trust
1) about 5-6 families
2) kids are in high school or about to be
3) death of a character
4) a family drama that is has mystery
5) truths unfold
6) murder
7) rivalry
8) revenge
9) kids go to same school
10) about family
11) kids are close to each other either romantically or friends like
12)more then one person knows about truth
13) someone trying to find out the case
1) about 5-6 families
2) kids are in high school or about to be
3) death of a character
4) a family drama that is has mystery
5) truths unfold
6) murder
7) rivalry
8) revenge
9) kids go to same school
10) about family
11) kids are close to each other either romantically or friends like
12)more then one person knows about truth
13) someone trying to find out the case
IFWT is technically more superior for sure but like IFWT , FFKD has HEART. Both stories are more geared toward family and brothers especially are the main plot in both the shows and if I'm going to be honest, the male leads in both shows are so gorgeous. There's also a very essential crime plot even though IFWT crime aspect is more nuanced and FFKD is more dramatic melodrama. Both drama are total tear-jerkers.