"Happy-go-lucky" Natural Recordings by Native Speakers
Happy-go-lucky is an adjective that describes a person who is cheerful, carefree, and optimistic, often to an exaggerated extent. They tend to approach life with a "glass-half-full" attitude, are quick to smile and laugh, and rarely get too worried or upset about things.
"To happen" means to occur or take place, especially suddenly or unexpectedly. It can also mean to arrive or occur in a way that is not planned or intended. For example: "A sudden storm happened while we were camping."
Someone or something that is happily is doing so with a feeling of joy, contentment, or satisfaction. For example, "She is happily married with two children." The word "happily" is often used to indicate a positive emotional state or a sense of fulfillment. It can also be used to convey a sense of ease or lack of difficulty, as in "I am happily playing my favorite video game."