If a person who has continued to be an insured person from the preceding month (excluding an insured person with optional and continued coverage; hereinafter the same applies to the following Article and Article 159-3) or who becomes eligible to be an insured person falls under any of the items in Article 118, paragraph (1), insurance premiums are not collected from the month in which the person first falls under the item until the month preceding the month in which the person no longer falls under any of the items of the same paragraph; however, this does not apply if the insured person falls under any of the items of the same paragraph and then no longer falls under any of those items in the same month.