The structure of Verb + Result Complement is used to describe the result of an action.
Eg: 做完 看见 买到 说清楚 放下 抬高 忘掉 走开 走进去 打开 关上 ect.
There are two ways to negate this structure:
put negatives(不/没/别/不要/没有 etc.) before verbs, like 没做完 没忘掉 没看见 没买到 别放下 不要打开 没有走进去. This form of negation means that the action is NOT done(没有走进去/不走进去), or is asked to NOT be done(别放下), or is done but the result is not expected (没做完).
Note: 不走进去 sounds incompleted, so we don't use it alone. But we can put it in a full sentence, like 这个房间，你 不走进去 就不知道它有多大。
put negative 不 between Verb and Complement, like 做不完 看不见 买不到 抬不高 打不开 关不上. This form of negation means that the subject performed this action, but was NOT ABLE to achieve the expected result.
it means not only negetive, but also disability, or impossible.
say, some one mentioned 不走进去, which is totally different from 走不进去
不走进去 means you are not willing to get into, or you are lack of the motivation
走不进去 means you want to get into, even you tried, but you failed to get into
Lovemaking... from then on, 啪啪啪 had become an Chinese internet slang for "lovemaking" ...