I personally love the Cold ML plots but here are four that I remember:
The Eternal Love - A second season, ML starts cold but not for long, he is outgoing and so is the FL.
The Princess Wei Young - The ML is a prince and is sometimes serious due to the politics part of the story but is outgoing with most people, including the FL.
The Romance of Hua Rong - Highly recommend this. No cold ML or FL, they bicker often like the leads from TROTAR.
My Fantastic Mrs Right: Season 1 - Another season to this. Prince ML starts cold for a few episodes but he is secretly outgoing.