Both are very game based. The characters are continuously faced with games (which relate to their current problems in the plot) and need to find a way to solve them (to move forward with the story; save someone or themselves, get something, etc).

Similar in the fact that both main leads are framed for murder (in place of something else) and that they try their best to escape and survive their predicaments in order to save/revenge their family. Who they are and are not able to trust plays a big role in their survival.

Stories of affairs, and some relations in the school environment as well. Tests of the strength of love.

Complications between reason for marriage, revenge, lovers, family, greed, ambition and so on. Corruption and revenge are the main sources of problem in both.

People who come together, as well as certain people who have their lives changed by the comradery of a team and friends.

Looking for a good cry about people who are trying hard in their lives but are presented with tradegies that they can't help.

The fight for good and evil are similar in both. Both main characters seek to correct the blood within them that gives them special power. Both have a cross-dressing lead, who present both a weakness and strength to the male lead.

Another vampire dramas, but note power differences of each. Both main characters of very alluring blood scents.

Somehow the tribulations of the dramas reminded me of them. Relation between them might be that strong, but I think the romance is a bit similar.

Kind of the power of love that throw test and trials is what pulls you through. Be careful of enemies, who are much closer than you think.

Beautiful stories about how certain belief can change the lives of others. Test and trials of plenty, and in the end, friendship or comradery is the answer.

Both have to due with psychology. Though the plot doesn't really have much in similar other than maybe that both stories about testing that is imposed on people (to different extremes though). Watching Madam Antoine might make up for the lack of romance between Da Jung and Woo JIn.
Beautiful stories of changing the lives of others.