Not really a quote but this was used a lot during the drama.

"What a coincidence!"

"I'm afraid that you will be under pressure and give up the opportunity to study abroad if I propose marriage. I love you and respect you. Before becoming my lover, you are yourself first. I will never tie you with love selfishly but I will wait for you."

                                                                                                 - Xing Ke Lei

Xing Ke Lei : Everytime I go on on a mission, no matter how dangerous it is, I can handle it calmly when I think about your smile.

"I am not the only one you are to protect. You are also to protect the whole city"                                                     - Mi Ka

“I saved you once. You saved me as well. Courtesy demands reciprocity.”

My favorite is actually from Dr. Shao when he was talking to Ke Yao under the stars.

~Life is a journey with lots of branches. Each branch leads to different views. It’s not right or wrong to choose any branch. Different branches may lead to the same end.