Both are heartwarming little stories of people riding a bus.
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Both are xianxia (but set on earth) dramas in which the FL rescues the non human ML and he falls in love with her, faithfully following her everywhere. Both FLs are wounded by their pasts and MLs are puppy like.

Both are mini dramas in which the FL complains about a work of fiction (book vs. drama) only to be pulled into that world and fall in love with the ML.

In both, one of the leads has very bad luck and discovers by getting close to the other lead who has very good luck, their luck improves. This results in them pretending to be in love with this other lead.

Both are historical dramas and the FLs are an inversion of each other - Maids is about a noblewoman who becomes a slave, and TToLO is about a slave who becomes a noblewoman.

Both are mini dramas in which one of the leads are caught in a time loop, trying to save themselves and the other lead.

Both are about someone caught in a time loop that always ends with their death, and their efforts to discover who is behind the events, with many different suspects to consider.

Both are about an object that allows one or both of the leads to travel back a few hours in time to undo their deaths as they try to figure out who is killing them.

Both are about an object that allows one or both of the leads to travel back a few hours in time to undo their deaths as they try to figure out who is killing them.

Both MLs have face blindness and the other lead is the only person whose face they can recognize.
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Both FLs disguise themselves as boys to enter an all male activity to fulfill a dream relating to a loved one. They end up sharing a dorm with the ML with whom they fall in love.

Both are set at a publishing company. Both FLs are at a low point in their lives and are older than the MLs who fall first.