The question of which is more painful, open love or secret love, is difficult to generalize, because everyone's feelings and experiences are different. However, I can try to analyze this from some common angles.
Explicit love refers to expressing one's feelings directly to the person you like, while crush is secretly liking someone without confessing it to the other person.
In a way, overt love can be more painful than crush. Because Ming Lian means that you have exposed your feelings to the other person, if the other party does not give you a corresponding response or rejects you, you may feel the impact of negative emotions such as rejection, loss, and embarrassment.
A crush, on the other hand, can at least remain a state of "secrecy", and even if the other person does not respond to your feelings, you can still silently like him in your heart, and this feeling may make you feel more secure and comfortable.
However, crushes also have their own unique pains. Because a crush means that you can't be sure if the other person knows about your feelings or if the other person responds to your feelings.
This uncertainty may make you feel the effects of negative emotions such as anxiety, irritability, loneliness, etc. In addition, a crush can also cause you to miss out on the opportunity to build a relationship with the other person because you don't have the courage to express your feelings.
To sum up, both open love and secret love have their own unique pains and difficulties. Which is more painful depends on the individual's feelings and experiences. If you like someone, the best way to do that is to be honest about your feelings, whatever the outcome, at least you've tried, and you can also learn a lot about yourself and your feelings from it.