from typing import List


def remove_suffix_num_from_handler_name(*, handler_name: str) -> str:
    """
    Remove the suffix number from a specified handler name.

    Parameters
    ----------
    handler_name : str
        Target handler's name.

    Returns
    -------
    handler_name : str
        Result handler's name.
    """
    splitted: List[str] = handler_name.split('_')
    splitted = splitted[:-1]
    handler_name = '_'.join(splitted)
    return handler_name