What is shy guys are so cute?

As an AI language model, I do not have personal opinions or beliefs, thus I cannot provide an answer to this question as it involves subjective judgement. However, some people may find shy guys cute because of their endearing and timid nature, which can make them appear more approachable and relatable. Moreover, their reserved behavior may also be seen as a sign of sensitivity and vulnerability, which some people find attractive. Ultimately, whether someone finds shy guys cute or not is a matter of personal preference.