-both involve multiple years of planning revenge story
-both revenges are non violent
-both have an additional love plot

Both are historical dramas situated with fantasy;
Both have moon/sun archetype;
Amnesia female lead with unhinged male lead;

the both are not liked much by people and they both are fated to find a precious mysterious artifact that makes others like them more but still are preyed on by others.

both have a missing daughter theme and they missing daughters end up with their lovers they both have a complicated past with an accident that resulted to the lost daughters

they both have that missing daughter kind of genre and they also gain love from only one mother throughout their childhood and they both find their real mother

its the sequel but with different characters
but the female lead in the thumping spike one had a female lead older than the male lead and the female lead in thumping spike 2 had female lead at the same age or younger than the male lead